Easy Make-Ahead Breakfast Casserole Recipe
Introduction
This Easy Make-Ahead Breakfast Casserole is perfect for busy mornings or casual brunches. Packed with savory sausage, fresh vegetables, and melted cheddar cheese, it’s a hearty and comforting start to your day. Plus, you can prepare it the night before to save time.
Ingredients
- 4 cups (175g or 6 oz) cubes of crusty bread*
- 1 teaspoon olive oil
- 1 pound ground pork sausage, casings removed*
- 1 teaspoon dried rosemary or Italian seasoning, optional
- 3/4 cup (100g) chopped yellow onion (1/2 of a large onion)
- 2 garlic cloves, minced
- 2 cups (275g or 9-10 oz) chopped bell peppers
- 1 cup (100g or 3 oz) sliced mushrooms
- 1 cup roughly chopped fresh spinach
- 12 large eggs
- 1/4 teaspoon salt
- 1/8 teaspoon freshly ground black pepper
- 2/3 cup (160ml) milk or half-and-half*
- 1 cup (100g or 3.5 oz) shredded cheddar cheese
- Optional garnish: green onion and/or chopped parsley
Instructions
- Step 1: Grease a 9×13-inch or any 3–4-quart oven-safe dish. Arrange the bread cubes in an even layer on the bottom of the pan.
- Step 2: Heat olive oil in a large skillet over medium heat. Add the sausage and rosemary or Italian seasoning if using. Break the sausage into bite-size pieces as it cooks. Add onion, garlic, bell peppers, mushrooms, and spinach. Cook until vegetables soften slightly and sausage is nearly cooked through, about 5–6 minutes.
- Step 3: Remove the sausage and vegetable mixture from heat and spread it evenly over the bread cubes in the casserole dish.
- Step 4: In a large bowl, whisk together the eggs, salt, pepper, milk or half-and-half, and shredded cheddar cheese. Pour this mixture evenly over the sausage and vegetables. Sprinkle a little extra salt and pepper on top.
- Step 5: Cover the casserole tightly with plastic wrap or aluminum foil and refrigerate for at least 30 minutes or up to 24 hours. When ready to bake, let the casserole sit at room temperature for 10–15 minutes while you preheat the oven.
- Step 6: Preheat the oven to 375°F (191°C). Bake the casserole uncovered until the top is golden and the edges are crisp, about 40–45 minutes. A toothpick inserted in the center should come out clean.
- Step 7: Allow the casserole to cool for 10 minutes before slicing. Garnish with green onion or parsley if desired, and serve warm.
Tips & Variations
- Use day-old or slightly stale bread for better texture that soaks up the egg mixture without becoming mushy.
- Substitute ground turkey or chicken sausage for a leaner version.
- Add different vegetables like zucchini or broccoli to customize the flavor and nutrition.
- For a vegetarian option, omit the sausage and add extra mushrooms or sautéed tofu.
- Sprinkle some Parmesan or mozzarella cheese on top for a different cheesy twist.
Storage
Store any leftovers covered in the refrigerator for up to 5 days. Reheat individual portions in the microwave until warmed through. You can also freeze the baked casserole in portions for up to 2 months; thaw in the refrigerator overnight before reheating.
How to Serve
Serve this delicious recipe with your favorite sides.
FAQs
Can I prepare this casserole the night before?
Yes! This casserole is designed to be made ahead. After assembling, cover and refrigerate for up to 24 hours before baking. Just allow it to sit at room temperature for 10–15 minutes before popping it in the oven.
What type of bread works best in this recipe?
Crusty bread such as sourdough, French bread, or a rustic country loaf works best. Using slightly stale or day-old bread helps it absorb the egg mixture without turning soggy.
Print
Easy Make-Ahead Breakfast Casserole Recipe
- Total Time: 1 hour 5 minutes
- Yield: 8 servings 1x
Description
This Easy Make-Ahead Breakfast Casserole is a savory and satisfying dish perfect for busy mornings or brunch gatherings. Packed with crusty bread, flavorful ground pork sausage, sautéed vegetables, and rich cheddar cheese, it can be prepared ahead of time and baked fresh when ready. The casserole is hearty yet versatile, with optional herbs and garnish to personalize your breakfast experience.
Ingredients
Scale
Base
- 4 cups (175g or 6 oz) cubes of crusty bread
- 1 teaspoon olive oil
Sausage and Vegetables
- 1 pound ground pork sausage, casings removed
- 1 teaspoon dried rosemary or Italian seasoning (optional)
- 3/4 cup (100g) chopped yellow onion (1/2 of a large onion)
- 2 garlic cloves, minced
- 2 cups (275g or 9–10 oz) chopped bell peppers
- 1 cup (100g or 3 oz) sliced mushrooms
- 1 cup roughly chopped fresh spinach
Egg Mixture
- 12 large eggs
- 1/4 teaspoon salt
- 1/8 teaspoon freshly ground black pepper
- 2/3 cup (160ml) milk or half-and-half
- 1 cup (100g or 3.5 oz) shredded cheddar cheese
Optional Garnish
- Green onion and/or chopped parsley
Instructions
- Prepare the baking dish: Grease a 9×13-inch or any 3–4-quart oven-safe dish thoroughly. Arrange the crusty bread cubes in an even layer covering the bottom of the dish.
- Cook the sausage and vegetables: Heat the olive oil in a large skillet over medium heat. Add the ground pork sausage along with the dried rosemary or Italian seasoning if using. Break the sausage into bite-sized pieces with a wooden spoon or spatula. Once the sausage begins to brown, add the chopped yellow onion, minced garlic, chopped bell peppers, sliced mushrooms, and roughly chopped spinach. Cook while stirring occasionally until the vegetables soften slightly and the sausage is mostly cooked through, approximately 5 to 6 minutes.
- Layer the cooked mixture: Remove the sausage and vegetable mixture from the heat and spread it evenly on top of the bread cubes in the baking dish.
- Mix the egg custard: In a large bowl, whisk together the 12 eggs, salt, freshly ground black pepper, milk or half-and-half, and shredded cheddar cheese until fully combined. Pour this egg mixture evenly over the sausage and vegetable layer in the dish. For added seasoning, sprinkle a little more salt and pepper on top if desired.
- Refrigerate: Cover the casserole tightly with plastic wrap or aluminum foil. Refrigerate for at least 30 minutes and up to 24 hours so the bread can absorb the egg mixture. Before baking, allow the casserole to sit at room temperature for 10 to 15 minutes as you preheat the oven.
- Bake the casserole: Preheat the oven to 375°F (191°C). Bake the uncovered casserole for 40 to 45 minutes or until the top turns golden, the edges become crispy, and a toothpick inserted into the center comes out clean.
- Cool and serve: Let the casserole cool for 10 minutes to set before slicing. Garnish with chopped green onion or parsley if preferred and serve warm.
- Store leftovers: Refrigerate any leftovers for up to 5 days. When ready to eat, reheat individual portions in the microwave to your liking.
Notes
- You can substitute the ground pork sausage with ground turkey or vegetarian sausage for a different flavor or dietary preference.
- If you prefer a dairy-free option, use a plant-based milk and cheese alternative.
- Adding more herbs such as thyme or sage can amplify the flavor profile.
- For extra crispiness, broil the casserole for the last 2 minutes of baking, watching carefully to prevent burning.
- Ensure the bread cubes are slightly stale or toasted to prevent the casserole from becoming soggy.
- This casserole can be prepared entirely the day before to save time on a busy morning.
- Prep Time: 20 minutes
- Cook Time: 45 minutes
- Category: Breakfast Casserole
- Method: Baking
- Cuisine: American
Keywords: breakfast casserole, make-ahead breakfast, sausage breakfast casserole, baked egg casserole, easy breakfast recipe
